Commercial Roofing in the Chicago Suburbs, Planned Around Your Tenants

Signs you may need commercial roofing

• Water standing in the same low spots two days after a rain
• Seams lifting, blistering or showing open laps you can slip a finger into
• Stained ceiling tiles near rooftop units, roof drains or exterior walls
• Loose, bent or rattling edge metal and coping after a windstorm
• Cracked sealant or empty pitch pans around pipes, conduit and sign supports
• A roof nobody has walked in over a year, with no written record of its condition

Commercial roofing in the Chicago suburbs: the buildings we work on

• Light-industrial and flex space. Big, mostly open roofs over steel deck and rigid insulation, with interior drains, exhaust fans and skylights or smoke hatches. A leak can go unnoticed until racking or inventory gets wet, so drains and penetration flashing get most of our attention.
• Strip retail. Every tenant brings its own rooftop unit and sign penetrations, and restaurants add kitchen exhaust. Grease from exhaust fans softens some membranes; PVC tolerates it better, and grease-containment boxes keep the rest of the roof clean.
• Small office buildings. Occupied all day and sensitive to noise and odor, so work is sequenced around business hours and fresh-air intakes.
• Condo and townhome associations. Often a mix of shingled slopes and flat sections over garages or between buildings, governed by a board that needs comparable bids and a schedule it can explain to owners.
• Apartment buildings. Residents are home around the clock, parked cars compete with the dumpster for space, and top-floor units report every drip. Clear notices and daily dry-in matter as much as the membrane.

Where flat commercial roofs leak: ponding, seams, rooftop units and edge metal

Ponding water

The National Roofing Contractors Association (NRCA) treats water still standing 48 hours after rain as ponding. It adds weight, speeds membrane aging and sits on any flaw until it finds a way in. Common causes are blocked drain strainers, insulation crushed by foot traffic around equipment, and decks that have deflected between joists. Fixes range from clearing strainers to adding tapered insulation crickets or another drain. Where a parapet would trap water if a drain clogged, codes also call for secondary overflow drains or scuppers; we confirm yours exist and are open.

Seams and laps

TPO and PVC seams are welded with hot air, EPDM seams are bonded with primer and tape, and modified bitumen laps are sealed with heat or adhesive. We probe seams by hand, mark open laps on a roof plan and repair each one with the method that matches the original membrane.

Rooftop units

Curbs, condensate lines, gas piping and service traffic make rooftop equipment a frequent leak source. Dropped screws and access panels puncture membranes, and short curbs leave too little height for flashing; industry guidance calls for base flashing to rise roughly 8 inches above the roof surface. Walkway pads along service routes are an inexpensive way to keep technicians off the membrane.

Perimeter metal

Wind uplift is strongest at corners and edges. Once edge metal or coping loosens, wind gets under the membrane and starts peeling it back. The International Building Code points to the ANSI/SPRI ES-1 test standard for low-slope edge systems, so loose or undersized metal is replaced with tested profiles.

Commercial roof inspections and maintenance plans for property managers

Industry guidance, including NRCA’s, calls for low-slope roofs to be inspected at least twice a year and after severe weather. A maintenance plan puts those visits on the calendar so nobody has to remember them. A typical visit covers:

1. Clearing drains, scuppers and gutters, and removing screws, filters and packaging left by other trades.
2. Walking every seam, curb and penetration, probing laps and checking sealant at pitch pans and terminations.
3. Checking edge metal, coping and counterflashing for movement after winter or a wind event.
4. Looking at top-floor ceilings and, where reachable, the underside of the deck.
5. Photographing each defect and pinning it to a numbered roof plan.

If you pre-approve small repairs up to a limit you set, a split seam or a cracked pipe boot is fixed during the visit instead of waiting for a second trip. Larger items go into the report with options and a budget figure.

Phasing commercial roof work around tenants and residents

Most commercial roof replacements can happen with the building open, and the same goes for HOA roofing projects on occupied condo and townhome buildings. Planning is what makes that possible:

• Notices. We draft tenant or resident letters with dates, work hours, parking changes and a contact name, ready for your letterhead.
• Sections, not the whole roof. The roof is divided into areas small enough to tear off and make watertight before the crew leaves each day.
• Odor and air intakes. Some adhesives and primers give off strong fumes. We coordinate with your HVAC contractor to shut down or shield fresh-air intakes near the work, and use low-odor products where the roof system allows.
• Noise and lifts. Tear-off above occupied offices and crane lifts over entrances are scheduled early, after hours or on weekends when the site permits.
• Loading and parking. Dumpster and material staging are planned so deliveries, fire lanes and accessible spaces stay open.

Commercial roof repair, coating, recover or full replacement

The right answer depends on what is under the membrane. A moisture survey, using infrared or capacitance scanning confirmed by small core cuts, shows how much of the insulation is wet. Then:

• Repair when problems are local and the insulation is dry.
• Restore with a coating when the membrane is weathered but sound and the insulation is dry. A coating does not dry out wet insulation.
• Recover with a new membrane over the old roof only where code allows it. Rules based on the International Building Code prohibit recovering a roof that is water-soaked or deteriorated, or one that already has two or more coverings.
• Replace by tearing off to the deck. A full tear-off may trigger energy-code insulation requirements, so we confirm what applies with your building department while pricing.

Membrane choice follows the building. TPO, PVC, EPDM and modified bitumen each have strengths, outlined in our low-slope membrane guide. For smaller flat roofs on houses and mixed-use buildings, see flat roofing.

Photo reports for capital planning and board meetings

Owners and boards rarely see their roofs in person. Our reports are written for the people who approve budgets:

• A roof plan with every defect numbered and photographed.
• Each item ranked as fix now, fix this year, or plan for.
• An estimate of remaining service life, stated as a range with the reasoning behind it.
• Budget-level figures for repair, restoration and replacement, so reserves or a capital line can be set before a leak forces the decision.

What it costs

Commercial roofing is priced per project after a roof walk. Area, layers to remove, any insulation the energy code calls for, drains, edge metal, crane access and the phasing your tenants need all move the number. Where wet insulation is suspected, we take core samples before pricing so the bid reflects what is actually there. Maintenance visits are quoted per building for the year, which makes them simple to budget.

How the work goes

1. Roof walk

   We walk the roof, check drains and top-floor ceilings, and sketch a numbered roof plan.

2. Report and options

   You receive photos, priorities and budget figures for repair, restoration or replacement.

3. Schedule and notices

   Work is phased by section, with tenant notices and HVAC coordination agreed in advance.

4. Close-out

   Final photos, a marked-up roof plan and manufacturer warranty registration where one is offered.

Commercial Roofing questions

What license does a commercial roofing contractor need in Illinois?

Illinois licenses roofing contractors in two classes. A limited license covers residential buildings of up to eight units; commercial roofs, and residential buildings larger than that, require an unlimited license. Before awarding a commercial roofing contract, look up each bidder’s license class on the state’s IDFPR lookup. Our guide to Illinois roofing licenses shows how.

Is winter a bad time for commercial roof work?

Not for repairs, which happen year-round. Heat-welded membranes such as TPO and PVC can go down in the cold because their seams are fused with hot air, but many adhesives, primers and coatings list minimum application temperatures, and snow has to be cleared before new work starts. For a planned replacement, we usually suggest building between spring and fall and using the winter for the survey and budget approval.

Will you coordinate with our HVAC contractor?

Yes. When a rooftop unit has to be disconnected, raised onto a taller curb or reset, your mechanical contractor handles the equipment and we handle the curb flashing and membrane. We share a schedule so the unit is down as briefly as possible and the roof around it is never left open overnight.

What should tenants do when they spot a leak?

Move people and equipment away from the drip, put down a container, and keep everyone off ladders near wet light fixtures. Then report the location, the time and the weather to the property manager, ideally with a phone photo of the ceiling. That timing tells us whether the leak follows rain, snowmelt or HVAC condensate, which narrows the search on the roof.

Our townhome association has shingled roofs and flat sections. Can one contractor handle both?

Yes. Many associations pair pitched shingle roofs with low-slope areas over garages, entries or connecting links. Scoping them together means one crew details the transitions between the two, and the board gets a single schedule. Our residential roofing page covers the shingled side.